Gaya APA

Tocci, R, J., Widmer, N, S. (1998). Digital systems : principles and applications (7th Ed). Upper Saddle River, NJ: Prentice Hall International.

Gaya MLA

Tocci, Ronald, J.., Widmer, Neal, S.. "Digital systems : principles and applications". 7th Ed Upper Saddle River, NJ: Prentice Hall International, 1998. Text.